Swamp Pond is a 64-acre productive, nutrient-rich eutrophic lake in Sullivan County, New York. Water quality is graded D based on 1 sampling years through 2020. Compared to the 3 other monitored lakes in Sullivan County, Swamp Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 3.9 ft. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 64 acres |
Where to stay near Swamp Pond
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Fishing Swamp Pond
Location
County Ranking
Ranked #4 of 4 lakes in Sullivan County
Nearby Lakes in Sullivan County
Explore Swamp Pond across LakeGrade
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High nutrients, frequent algae, reduced clarity
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Reservoir Info (USACE NID)
Swamp Pond is a man-made reservoir impounded by the Weiden Lake Dam (completed 1920), built primarily for recreation on the EAST BRANCH TENMILE RIVER; concrete-type dam, 25 ft tall and 161 ft long.
- Surface area
- 64 ac
- Normal storage
- 495 ac-ft
- Max storage
- 650 ac-ft
- Hazard class
- Low
- Owner
- WEIDEN LAKE PROPOERTY OWNERS ASSOCIATION, INC.
Source: USACE National Inventory of Dams, NID ID NY01322 · Operator website
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Swamp Pond under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Narrowsburg Sd StpNarrowsburg · 4.3 mi away · NPDES NY0110205Recent violation
- Camp Sternberg-Anna HellerNarrowsburg · 3.6 mi away · NPDES NY0251071
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-29
Monitoring stations: 1